As he prepares for the London Marathon, ITV News has been given an exclusive insight into the training methods of one of the stars of the London Paralympics.
For David Weir, winner of four gold medals at the 2012 games, the hard work takes place on cold winter mornings in Richmond Park.
Rags Martel joined him to find out why the park plays such a central role in his success.
More top news
Police are appealing to find an absconder from a mental health unit in Haringey
Transport officials meet with Google in a bid to bring driverless cars to the streets London
Twenty-one-year-old pair raise nearly £40,000 in the world's toughest row.